Dental drill



UNITEDv STACIIIS PATENT 'omen'.

ADELBER'I H. WIIIN, oF'NAsHvILLn, MICHIGAN.

DENTALv DRILL.v

SPECIFICATION forming part of Leiters Patent Nq. 381,196, dated Apri11"1,1aa8.

` Application filed oeibr 21,1887. serial No. 253,032. v(rammel.)

To all whom, it may concern:

Be it known that I, ADELBERTH. WINN, a citizen of the United States, residing at Nash-v ville, in the county ofV Barry and State of Michigan, have invented certain Anew and useful Improvements in- Dental Drills; and I do hereby declare the following to be a full, clear, and exact description'of the invention, such as will enable others skilled in the art to which it appertains to make anduse the same.

My invention relates to improvements in that class of .dental drills which are by the hand of the operator and rotated by` some other suitable mechanism operating to turn a shaft or spind-levto which said drill `is attached. i t

The objects of myinvention are to provide means whereby ythe axis of the drill may be adjusted relative to the work without materially altering or changing the position of the axis of that portion of the shaft within the hand of the operator, and for that purpose to provide a suitable joint and connecting-gear-- ing near the drill, whereby said drill may be adjusted andy rotated, that shall be compact, adjustable at any'desired angle, easyof operation, and durable. Iam aware that similar results have been attempted by gears having rectangular interlocking `parts, and an adjustable joint held at certain intervals by a latch engaging with notches. Such gears do not operate well and such joint is adjustable at intervals only, and such latch `is too bulkyv when attached to .a dental drill. Iaccom plish these resultsby the mechanism illustrated inthe accompanying drawings, in Which- 4 Figure l is an elevation of a device -eml D Y bodying my'invention; Fig. 2, a horizontal section of the same on the line .fr x of Fig. l; Fig; 3, the same with the axis of the drill adjusted at right anglesto that of the drivingshaft, and Fig. 4 the same with the drill re:

versed and its axis parallel to that of the driving-shaft. l. i

Like letters refer to like parts in all the figures.

A is the driving-shaft and Bthe adjustable shaft, respectively journaled in the bearings guided` cv and D, which latter when Yadjacent@hasy I arevattachedto `each other by a hinge-joint,

consisting ofcircularplates F and L,attached to the respective Vends of said bearings, and Y connectedbya -suitable rivet, G, the. axis of which is tangent to the'pitch-line of the gears E at the point where said lines cross when the 5 5k said gears are adjusted to operate as bevel-f gears. Said gears are attached' to the( adjafcent ends'of the kshafts A and B, ,and serve to impart motion from one shaft to the:` other when adjusted in the various positions as here- 6o inafter described. 5 a

The plate F` lhas a Worm-gear in its.pe l

riphery, with which the/screw. H engages to rotate theV said plate and partssupported thereby about the axisof the rivet G. kSaid screw also serves to hold thel parts .in any' given position when adjusted, yand mayxbe' 1 'burned byally' convenient.l key applied. t the squared end of the same. 1 I aml thus enabled to effect adj ustmentat any angle Whatever inf 7o 'steadgof at intervals, and the device is more compactl and occupiesless room in the mouth.`

K represents a drill or other tool attached to theshaft B andadapted to operate byfrotafj tion uponits axis.jf

The. gears. E are primarily of the spur--` gear form. The difference consists in that the teethare extended'beyond the adjacent sidesl .0f the wheels, as shown at I, so that when the axes of the shafts A and B coincide said ex-` 8o f tensions I will interlock and theY gears will operate as ay coupling. rAs the axis of the" Y hingejoint referred toipasses through the:I

pointl of contact of'these extensions, they will at all times interlock lat that point regardless `of the relative directionvof the axes ofthe shafts A and B, the result being that motion .g` is imparted from one shaft tothe other-in 'allA the variousr adjustments of the shafts' within the ninety degrees included between the posi' 9o- Y tions, as shown in Figs. l and 4, respectively.

The extended portions I of the gear-teeth l are'semiciroular in shape, the center oflsaid semi-circle being at the point where the pitch-v Alines of the vgears cross' when ioperating Ias 9.5

bevel-gears. By virtue of such form they en'-' gage with each other the same and to like exjusted by a worm gear and screw, and gears tent in all positions, run smoothly, and are having semicircular interlocking teeth, submore durable.

The operation of my device is obvious and 5 needs no further description.

What I claim, and wish to secureby Letters Patent, is as follows:

In a dental drill, adriving-shaft and a shaft having the tool attached, in combination with xo bearings connected by a hinge-joint and adstantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

ADELBERT H. WINN.

Witnesses:

WALTER WEBSTER, J AMES B. MILLS. 

